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How to check max session count? and current session count??
HyeontaeJu
Vertica Customer ✭
Hello, I'm managing a vertica database cluster and more and more projects will use vertica database.
today, connection timeout exception is occured when i run another project which use vertica database.
so.. i doubt that the connection session count reach max connection session count
How to check max session count? and current session count??
0
Answers
• To determine the original value for the MaxClientSessions parameter:
=> SELECT CURRENT_VALUE FROM CONFIGURATION_PARAMETERS WHERE parameter_name='MaxClientSessions';
CURRENT_VALUE
50
(1 row)
• To increase the MaxClientSessions parameter to 100 (for example) do:
=> SELECT SET_CONFIG_PARAMETER('MaxClientSessions', 100);
BTW, I would expect to see an error like: "New session rejected due to limit, already 55 sessions activ"
To monitor requests for resources that are rejected by the Resource Manager do: SELECT * FROM resource_rejections;
The V_MONITOR.ERROR_MESSAGES system table tracks error and warning messages encountered while processing queries.
SELECT event_timestamp, user_name, message FROM error_messages ORDER BY event_timestamp DESC;
and check also dc_errors;